Adolescent ; Adult ; Female ; Health Care Surveys ; Health Status ; Humans ; Male ; Medical Waste Disposal ; Middle Aged ; Occupational Health ; Personnel, Hospital ; Young Adult

OBJECTIVETo economically obtain the Abeta peptide for Alzheimer's disease (AD) research by expressing the Abeta peptide fused with the maltose binding protein (MBP) possessing high solubility in E.coli.

METHODSThe cDNA-coding sequence of Abeta peptide was modified by the addition of a BamH I site at the 5' end and a Hind III site at the 3' end using PCR. The modified sequence was ligated into the maltose-binding protein (MBP) fusion expression vector pMAL-c2 containing an thrombin cleavage site, which was transformed into competent E.coli DH5alpha cells. After identification of the single clones by PCR and DNA sequencing, the recombinant plasmid was transformed into E.coli TB1 and induced to express MBP-Abeta fusion protein. The expressed fusion protein was purified using amylose resin column and identified by SDS-PAGE and Western blotting.

RESULTSThe result of DNA sequencing verified the consistency between the inserted sequence and Abeta (1-42) sequence. SDS-PAGE electrophoresis showed that MBP-Abeta fusion protein was highly expressed in E.coli TB1, and Western blotting demonstrated that the purified fusion protein and the separated Abeta peptide could be recognized by specific anti-Abeta (22-35) antibody.

CONCLUSIONMBP-Abeta fusion protein highly expressed in E. coli TB1 cells with enhanced solubility and the separated Abeta peptide with good immunogenicity obtained may lend support to AD research.

Alzheimer Disease ; genetics ; Amyloid beta-Peptides ; biosynthesis ; genetics ; Escherichia coli ; genetics ; metabolism ; Genetic Vectors ; genetics ; Humans ; Maltose-Binding Proteins ; biosynthesis ; genetics ; Recombinant Fusion Proteins ; biosynthesis ; genetics ; isolation & purification

OBJECTIVETo identify the IgE-binding epitopes in the allergen Der p 1 of main house dust mites, which can be recognized by the specific IgE in the sera from allergic individuals, and obtain a hypoallergen derived from the T-B epitope fused peptide for potential use in specific immunotherapy (SIT).

METHODSThirty-one peptides containing 15 amino acids each, which covered the full 222 amino acids of Der p 1 protein sequence, were synthesized on the cellulous membrane by solid-phase peptide (SPOTs) synthesis, with 8 overlapping amino acids between every two neighboring peptides. The membrane bearing the spots of the synthesized peptides were incubated with the allergic serum pools consisting of the sera from 5 allergic individuals. The membrane was then probed with HRP-conjugated anti-human IgE, followed by enhanced chemiluminescence (ECL) for visualization and gray scale analysis of the positive peptide spots.

RESULTSThree strong IgE-binding epitopes were identified in the amino acid sequence of Der p 1 molecule, namely Ep1 (amino acids 85-99), Ep2 (amino acids 106-120) and Ep3 (amino acids 190-204).

CONCLUSIONThe 3 IgE-binding epitopes (B cell epitopes) identified in Der p 1 confirm the presence of linear epitopes in Der p 1, suggesting the possibility of constructing T/B epitope-fused hypoallergens.

Amino Acid Sequence ; Animals ; Antigens, Dermatophagoides ; immunology ; Arthropod Proteins ; immunology ; Binding Sites, Antibody ; Cysteine Endopeptidases ; immunology ; Epitopes ; immunology ; Immunoglobulin E ; immunology ; Lymphokines ; immunology ; Mites ; immunology ; Molecular Sequence Data

OBJECTIVETo investigate the effect and the mechanism of Shenfu injection (SFI) on the resuscitation from general anesthesia.

METHODSForty patients who received selective abdominal surgery with general anesthesia for 3-4 hrs and ASA grade I-II were divided into two groups, the trial group and the control group, 20 patients in each group. After being sent into the postanesthesia care unit (PACU), the trial group was treated with intravenous dripping of SFI 1.0 ml/kg and the control group was treated with intravenous dripping of equal volume of normal saline. All patients were observed in double blindly manner, the self ventilation recovery time, extubation time, the time of leaving PACU and their Glasgow coma scale (GCS) were recorded and compared. 2 ml of peripheral venous blood were taken to determine the plasma beta-endorphin (beta-EP) content at the time points of before (T1), 5 min (T2), 15 min (T3) and 30 min (T4) after dripping.

RESULTSThe self ventilation recovery time, extubation time and time of leaving PACU in the trial group were all shorter than those in the control group (P < 0.01), the GCS in the trial group was better than that in the control group (P < 0.01). The plasma content of beta-EP raised gradually along the recovering of patients consciousness, as compared with the content before dripping (T1), it showed insignificant difference at time point T2 but significant difference at T3 and T4 comparison at the corresponding time point showed that the content at T1 and T2 were similar in the two groups (P > 0.05), but at T3 and T4, the content was higher in the trial group than that in the control group respectively (P < 0.01).

CONCLUSIONSFI could accelerate the resuscitation after general anesthesia, the mechanism may be related with its action in raising plasma beta-EP level.

Adolescent ; Adult ; Aged ; Anesthesia Recovery Period ; Anesthesia, General ; Colonic Neoplasms ; surgery ; Drugs, Chinese Herbal ; administration & dosage ; Female ; Gastrectomy ; Humans ; Infusions, Intravenous ; Male ; Middle Aged ; beta-Endorphin ; blood

Through study on the correlation between Atractylodis macrocephala lactones ingredient content and topographic factors, we researched regionalization from topography of five main producing provinces of the country, in order to provide a scientific basis for A. macrocephala reasonable cultivation. By sampling from 40 origins of five main producing provinces of the country, the variation of A. macrocephala lactones ingredient content in different conditions of topographic factors and the effect of altitude, slope and aspect was analyzed by SPSS. Then according to the relationship between A. macrocephala lactones ingredient content and topographic factors, the ecological suitability regionalization was conducted by using ArcGIS based on topographic factors. It is suitable for growth of A. macrocephala in the hilly and mountainous areas of southern whose A. macrocephala lactones ingredient content is in high levels. It is unsuitable for growth of A. macrocephala in Northern plain areas, but we can cultivate A. macrocephala in the hilly and mountainous areas of Northern. The most suitable topographic condition for cultivation of A. macrocephala : altitude 200 meters above, slope 3.00-4.99 degrees.
Altitude ; Atractylodes ; chemistry ; growth & development ; China ; Conservation of Natural Resources ; Drugs, Chinese Herbal ; analysis ; Ecosystem

Chemical constituents of ethyl acetate extract of Illicium burmanicum were isolated and purified by various chromatographic methods,including Silica gel, Sephadex LH-20, C18 reverse-phased silica gel, Preparative TLC and Preparative HPLC. Their structures were identified by spectral analysis including NMR and MS data. Fourteen compounds were separated from I. burmanicum and their structures were identified as 7S,8R-erythro-4,7,9,9'-tetrahydroxy-3,3'-dimethoxy-8-O-4'-neolignan (1), 7R,8R-threo-4,7, 9,9'-tetrahydroxy-3,3 '-dimethoxy-8-O-4'-neolignan(2) ,polystachyol(3), (-) -massoniresinol(4), angustanoic acid F (5), trans-sobrerol(6), (3S,6R) -6,7-dihydroxy-6,7-dihydrolinalool (7), (3S, 6S) -6,7-dihydroxy-6,7-dihydrolinalool (8), 2,6-dimethoxy-4-allyl-phenol (9), 3,5-dihydroxy4-hydroxy benzaldehyde (10), 3-hydroxy4-methoxybenzaldehyde (11), methyl vanillate (12), shikimic acid ethylester (13) and beta-sitosrerol (14). Except compound 14, the rest thirteen compounds were separated from this plant for the first time.
Drugs, Chinese Herbal ; chemistry ; isolation & purification ; Illicium ; chemistry ; Molecular Structure ; Spectrometry, Mass, Electrospray Ionization

BACKGROUND: Recently, some people believed that the mechanisms of primary hepatic carcinoma might be caused by poor differentiation or disdifferentiation of hepatic stem cells. Studies on hepatic stem cells are in the early stage at present, and the theory of "stem cell origins" of human primary hepatic carcinoma deserves further verification. OBJECTIVE: To investigate the activation, distribution, origin and immunological expression characteristics of hepatic stem cells in different histopathologic types of primary hepatic carcinoma. DESIGN: Observational comparative study. SETTING: Tumor Center, Research Institute of Surgery, Daping Hospital, Third Military Medical University of Chinese PLA. PARTICIPANTS: Experiments were performed at the Laboratory of Tumor Center, Research Institute of Surgery, Daping Hospital, Third Military Medical University of Chinese PLA from September 2003 to July 2004. We took 94 cases of hepatic cellular cancer, 12 cases of intrahepatic cholangiocellular carcinoma and 10 cases of mixed hepatocarcinoma paraffin-embedded tissue blocks as research objects, with 5 cases of liver cirrhosis and 4 cases of normal liver as experimental control. These materials were collected from the archive of the Department of Pathology of Daping Hospital. Primary hepatic carcinoma tissues and corresponding adjacent liver tissues were obtained from patients who had undergone surgery for the removal of their tumors. All the patients were not treated by chemotherapy or radiotherapy before the operation. They had signed the informed consent. Main Antibodies were bought from Santa Cruz Company.METHODS: The histological and immunohistochemical characteristics were examined by haematoxylin and eosin staining and immunohistochemistry (SP method), including mouse antihuman cytokeratin 19 monoclonal antibody, mouse antihuman cytokeratin 7 monoclonal antibody, mouse antihuman cytokeratin 8&&18 monoclonal antibody, mouse antihuman c-kit monoclonal antibody, mouse antihuman Thy-1 monoclonal antibody, mouse antihuman alpha fetoprotein monoclonal antibody. MAIN OUTCOME MEASURES: Expression of immunological markers of hepatic stem cells in different histopathologic types. RESULTS: Immunological markers of hepatic stem cells expressed variously in different histopathologic types of primary hepatic carcinoma. Hepatic stem cells differentiated into hepatoma carcinoma cells in all the types. The highest expression rate of hepatic stem cell immunophenotype was found in the mixed hepatocarcinoma (P < 0.05). Immunophenotypes of hepatic stem cells were negative in normal group and cirrhosis group. CONCLUSION: Hepatic stem cells of varied differentiations and origins existed in different histopathologic types of primary hepatic carcinoma.

OBJECTIVETo study the chemical components from dried roots of Zanthoxylum dimorphophyllum var. spinifoliun.

METHODThe chemical components were isolated by low pressure column chromatography and their structures were identified by spectroscopic methods.

RESULTFive compounds were isolated and identified as 6-(2', 3'-dihydroxy-3'-methyl-butyl)-7-hydroxy-5-methoxy-2H-1-benzopyran-2-one (I), 6-(2',3'-dihydroxy-3'-methyl-butyl)-7-methoxy-8-(3'-methyl-but-2'-enyl)-2H-1-benzopyran-2-one (II),6-(2',3'-dihydroxy-3'-methyl-butyl)-7-hydroxy-2H-1-benzopyran-2-one (III), 6-(2', 3'-oxiranyl-3'-methyl-butyl)-7-methoxy-8- (3-methyl-but-2-enyl)-2H-1-benzopyran-2-one (IV), 7-methoxy-8-(3'-methyl-but-2'-enyl)-2H-1-benzopyran-2-one (V).

CONCLUSIONThese compounds were isolated from the plant for the first time.

Coumarins ; chemistry ; isolation & purification ; Plant Roots ; chemistry ; Plants, Medicinal ; chemistry ; Zanthoxylum ; chemistry

OBJECTIVETo investigate the displacement, the position of rotation center and the stress distribution of PDL under different loading force system (Moment/Force, M/F) by simulating clinical loading force system.

METHODSA three-dimensional finite element model of upper central incisor, which consists of 945 isoparametric elements and 1,245 nodes was developed. The displacement, the position of the rotation center and the stress distribution of PDL were analyzed under 13 types of loading force system.

RESULTS1. Different force system led to different types of tooth movement. When M/F= -9.15:1, -10.30 - -10.50:1 and -10.90:1, it brought the result of controlled tipping movement, the bodily movement and the root movement; 2. The graph of the center rotation was a hyperbolic asymptotic line: Mx/Fy = -10.50 (horizontal axis) and L = 6.75 (vertical axis). Moreover, a little change of M/F between -9.15 and -10.90 led to apparent change of the position of rotation center. 3. The maximum strain and stress during the tipping movement were 1.47 x 10(-2) MPa and -2.81 x 10(-2) MPa, and during the bodily movement the results were 1.10 x 10(-2) MPa and -1.86 x 10(-2) MPa, while during the root movement were 0.96 x 10(-2) MPa and -2.58 x 10(-2) MPa.

CONCLUSION1 . Different force system (M/F) leads to different types of tooth movement. 2. It is necessary to adjust the force system accurately to obtain prescient tooth movement, especially when M/F changes between -9.15:1 and -10.90:1. 3. This study suggested that the tooth movement style and the force system (M/F) should be controlled to protect the periodontal tissue.

Dental Stress Analysis ; Finite Element Analysis ; Humans ; Incisor ; physiology ; Models, Biological ; Periodontal Ligament ; physiology ; Tooth Movement Techniques

OBJECTIVEMany studies have shown that glucocorticoids play a crucial role in the development of obesity and insulin resistance. This study investigated the therapeutic effects of long-term inhibition of glucocorticoid activity on obesity and insulin resistance.

METHODSFour-week-old male Sprague-Dawley (SD) rats were randomly fed with a high-fat diet (fat content accounting for 20% of total calorie) (control group, n=8) or with a high-fat diet along with glycyrrhetic acid (GE, 800 mg/L), an inhibitor of 11beta-hydroxysteroid dehydrogenase (11beta-HSD) for 24 weeks (GE-treated group, n=9). The body weights and the amount of food intake were monitored weekly and daily, respectively. After 24 weeks of GE treatment, oral glucose tolerance tests were performed. Blood glucose was measured by glucose oxidase method. The levels of plasma glucocorticoids, insulin and leptin were measured with radioimmunoassay. The levels of serum cholesterol and triglyceride were determined with an automatic measuring analyzer.

RESULTSThe food intake amount decreased significantly in the GE-treated group from 6 weeks and body weight gain was markedly less from 8 weeks after GE administration compared with the control group. After 24 weeks of treatment, the plasma levels of leptin and insulin in GE-treated rats were significantly reduced compared with the control group. The serum levels of cholesterol and triglyceride decreased markedly compared with the control group and the levels of blood glucose were significantly lower 15, 30, 60 and 120 minutes after oral glucose load in the GE-treated group compared with the control group.

CONCLUSIONSLong-term GE treatment may contribute to resisting diet-induced obesity and insulin resistance.

11-beta-Hydroxysteroid Dehydrogenases ; antagonists & inhibitors ; Animals ; Body Weight ; drug effects ; Dietary Fats ; administration & dosage ; Enzyme Inhibitors ; pharmacology ; Glucocorticoids ; physiology ; Glucose Tolerance Test ; Glycyrrhetinic Acid ; pharmacology ; therapeutic use ; Insulin ; blood ; Insulin Resistance ; Leptin ; blood ; Male ; Obesity ; drug therapy ; Rats ; Rats, Sprague-Dawley